Cadamada 100ML Thick Glass Round Media Storage Bottles with Blue GL45 Screw Cap Pk/4 Thick Graduated Borosilicate Pyrex Glass Container

Weird plastic molded onto the lip on top of the glass jar itself does not allow a seal. All sizes leak. I’d love to return them as they are of no use to me. Why they have this hard plastic around the edge is beyond me.

Nice containers.